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In how many ways can you seat 8 students in a row so that Tom and John never sit together?
EXPLAIN YOUR THINKING BELOW.
Solution
total ways in which 8 students can sit in a row = 8!
let us take the number of ways in which Tom and John sit next to each other i.e assuming they
are always together so we have 7 students ( 6 others & 1 Tom and John) so total outcomes = 7!
so number of ways = 8! - 7! = 35280

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